How can I add any languages to an ISO file like this?

Easiest is using this: W10MUI

 

Did you download the zip and extract it and read the readme and checked the content of the Lang folder and the Ondemand folder?

The video would be the same but then you see a mouse arrow showing the same.

 

Yes:

Right below:

 

Dod you extract the zip and explored the readme and the mentioned folders?

 

Then you would have found this content in the:

Langs folder:

Code:

    10240-LPs.txt
    10586-LPs.txt
    14393-LPs.txt
    15063-LPs.txt
    16299-LPs.txt
    17134-LPs.txt
    17763-LPs.url
    18362-LPs.url
    19041-LPs.url
    20348-LPs.url
    22000-LPs.url
    22621-LPs.url
    26100-LPs_Alternative.txt <=== listing of the 26100 LanguagePacks

Ondemand folder:

Code:

|   10240-OnDemand.txt
|   10586-OnDemand.txt
|   14393-OnDemand.txt
|   15063-OnDemand.txt
|   16299-OnDemand.txt
|   17134-OnDemand.txt
|   17763-OnDemand.url
|   18362-OnDemand.url
|   19041-OnDemand.url
|   20348-OnDemand.url
|   22000-OnDemand.url
|   22621-OnDemand.url
|   26100-OnDemand.txt <=== listing of the 26100 Consumer/Business ondemand language files
|   26100-OnDemand_LTSC.txt <=== listing of the 26100 2024 LTSC ondemand language files
|   26100-OnDemand_Server.txt <=== listing of the 26100 server ondemand language files

 

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